Same as with many of the other L4D items, here's the Adrenaline ramastered 3D model. It can be downloaded for Left 4 Dead 2 from the Steam Workshop.

My remade version has 4108 triangles, original game asset has 4668 triangles. Portfolio textures on final asset are 4098^2, vs 1024^2 used in final game release. Original game asset uses 512^2 textures.

This was done with the help of zBrush and the boolean/dynamesh workflow.